Williamson (shoulder) allowed two hits and one walk while striking out two over two innings Tuesday in a rehab start for Triple-A Louisville.
Williamson got up to 31 pitches before rain came and spelled an early end to his night. The Reds were targeting 60 pitches for the left-hander, who eventually completed two up-and-downs in the bullpen to reach 65 pitches, per MLB.com. Williamson is in line to make at least one more rehab appearance for Louisville on Sunday.